How to show/print waiting message when system is serving pdf to browser

Hi,
does anybody know how to print/show "please wait for your request to be completed..." message when they try to click GeneratePdf button for example
they way i do serving pdf to the browser is as below
response.reset();
response.setContentLength(contentLength);
response.setContentType("application/pdf");
response.setHeader("Content-disposition", "inline; filename=\""System.currentTimeMillis()+".pdf"+ "\"");
output = new BufferedOutputStream(response.getOutputStream());
while (contentLength-- > 0) {
output.write(input.read());
output.flush();and this is what was written in my popup jsp ( when user click GeneratePdf , the application will process it and at the end serve pdf file to the user using popup window )
<body> <h1>Please Wait for your request to be completed...........</h1> </body> </html>
<%
boolean redirect=false;
try{
PdfDispatcher.dispatchApplication(response,session);
}catch(Throwable t){
System.out.println("Application Dispatcher Exception ... "+t.getMessage());
System.out.println("Continue as per normal....");
redirect = true; // will redirect to other jsp output
if(redirect){
//go to other jsp
}The problem is my message above never got printed to the page ( i guess because the browser thinks that the response has not been completed )
by the time the response has been completed the whole page will be cover in pdf document
The reason i want to do this because my user complaining that they see blank page for long time when the system is slow to generate/server pdf to them.
and it would be better to show some "waiting message" when the system is processing the application and server pdf at the end of the operations.
anybody know how to workaround this?
Thanks

just_a_kid83 wrote:
does anybody know how to print/show "please wait for your request to be completed..." message when they try to click GeneratePdf button for exampleUse JavaScript+DOM. Add a <div> somewhere in the page where the message should be displayed and put the message and an animated 'loading' gif in it. Hide the <div> using the CSS 'display' property which is set to 'none'. Then add an onclick event to the button/link which downloads the PDF file which gets the <div> element by its ID and set its 'display' property to 'block'.

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